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SwissChap

So I got an old frame (Cervelo P3-SL) recently and discovered there is some kind of a (very) thin brass insert in the seatpost. Is this likely to be there to solve slipping issues (seller is not reachable at this point, so I can't ask him right now), or would there be any other reason for using this? I've never seen anyone do this before, so I'm not sure what to think. Protection of the carbon seatpost from scratches from the rougher inside of the aluminium tube?

Should I keep using this as it clearly worked before, or should I try using it without it first and see what happens?

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Greenbank in reply to @SwissChap

Googling "cervelo seatpost shim" lead me to: https://www.sigmasports.com/item/Cervelo/Replacement-Shim-for-Flippable-Aero-Seatpins/48A

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SwissChap in reply to @Greenbank

Thanks, the rear part of the brass sheath looks like that (where it's 'doubled up'), but I don't think it was meant to be there - this is certainly not a 'flippable' seatpost, so I think that's not the same model (I think the modern P3 has a flippable seatpost?).

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